Answer:
The post-transition metals cluster to the lower left of this line. Metalloids: The metalloids are boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te) and polonium (Po). They form the staircase that represents the gradual transition from metals to nonmetals.
Explanation: i googled it
They are two representatives of the sublevels/energy levels.
The sum of the number of protons and neutrons in the nucleus of an atom is called the mass number (A), or nucleon number.
